Is Rectal Discharge Normal with a Diverting Ostomy?
Yes, it is completely normal for a patient with a diverting ostomy to pass mucus and small amounts of stool from the rectum. This occurs because the defunctionalized distal bowel segment continues to produce mucus and may retain some residual stool, which needs to be expelled 1.
Why This Happens
The defunctionalized distal segment of bowel (the portion downstream from the ostomy) remains viable and metabolically active despite being diverted from the fecal stream 1. This segment:
- Continues to produce intestinal mucus as part of normal bowel physiology 1
- May contain retained stool that was present at the time of surgery or minimal amounts that pass through the ostomy 1
- Requires drainage to prevent accumulation and discomfort 1
Expected Discharge Characteristics
The rectal discharge in patients with diverting ostomies typically consists of:
- Mucus (most common) - clear to white stringy material 1
- Small amounts of retained stool that gradually clear over time 1
- Occasional blood-tinged mucus (though significant bleeding warrants evaluation) 1
Evidence on Diversion Adequacy
Research confirms that properly constructed loop ostomies provide complete diversion of the fecal stream. A study examining 22 patients with loop ostomies using CT imaging with oral contrast found 0% had evidence of contrast passing into the distal limb, confirming adequate diversion 2. Additionally, a study using radio-opaque markers placed in the cecum after diverting ileostomy showed that in 20 of 22 patients, all markers remained in the right colon on day 7, demonstrating that colonic transit may be essentially abolished by the presence of a diverting ileostomy 3.
Important Caveats
When to be concerned - Rectal discharge is NOT normal if it involves:
- Large volumes of formed stool regularly passing per rectum, which may indicate inadequate diversion or ostomy malfunction 1
- Significant bleeding beyond minor blood-tinged mucus 1
- Purulent discharge suggesting infection or abscess 1
- Severe pain accompanying the discharge 1
Diversion Colitis Consideration
The defunctionalized bowel segment may develop diversion colitis, a benign inflammatory condition that occurs due to lack of fecal stream 4. This condition:
- Develops in most patients with defunctionalized bowel segments 4
- Causes mild chronic inflammation with possible crypt abscesses and follicular lymphoid hyperplasia 4
- May produce symptoms of abdominal pain or rectal discharge of blood or mucus, typically developing 9 months to 17 years after diversion 4
- Resolves rapidly after restoration of intestinal continuity 4
- Should not be mistaken for inflammatory bowel disease 4
Patient Counseling Points
Patients should be reassured that:
- Mucus discharge from the rectum is expected and represents normal function of the defunctionalized bowel 1
- The amount typically decreases over time as retained stool clears 1
- This does not indicate ostomy failure or the need for revision 2
- Wearing a pad may be helpful for comfort if discharge is bothersome 1